It's Jerry. No other team in the NFL would hire him as a GM, yet he continues to be the GM. This team is depleted on the O-line so what does he do - he gets a defensive back. No offense to Claiborne, he is a great athlete and he certainly has the potential to be a great NFL player. But in the NFL, if you don't have an O-line, you can't run the ball and you can't protect the QB. If you can't run and can't pass, you can't win. John Gruden was willing to coach the Cowboys but Jones said "No, I will make all personnel decisions" - so Gruden declined. For the last 20 years the only constant has been Jerry Jones. So yes - he is the cause.